Re: [ATM] bending square aluminium tube

["Jan van Gastel" <jhm.vangastel@wanadoo.nl>]

I think the advantages of working with a wooden jig in a vice, is :
1. That such a jig is very easy to make and
2. It is easy to make a ring of a certain diameter, because the diameter
ring is determined by the radius of the jig. I made three rings of around
326 mm diameter with my 145/160 (convex/concave) jig and the difference in
diameter is not more then about 1 millimeter. With a bit more experience
(these were my first three rings) this will be less.

Advantage of the rollertool is, that you can make rings of different
diameters using the same tool, while new wooden jig must be made for every
diameter. But because of point 1 above, that's no big deal.

Jan
http://home.wanadoo.nl/jhm.vangastel/Astronomy/


----- Original Message ----- 
From: "Bob May" <bobmay@nethere.com>
To: <atm@atmlist.net>
Sent: Thursday, January 06, 2005 2:19 AM
Subject: Re: [ATM] bending square aluminium tube


> You really need to make the rollers from metal rather than wood.  Wood
will
> work but you need to do some good precision work as the three wheel method
> needs to hold the positions of the three wheels precisely.  Any slop or
> flexibility will make the end product kinky as the forces aren't
consistent.
> Also, for small diameter bends, you need to do the work in stages til you
> get where you need it.
> Bob May
> bobmay@nethere.com
> http://nav.to/bobmay
> http://bobmay.astronomy.net
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/

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